5195461
Descripción
Fichas por Anisha Rai, actualizado hace más de 1 año
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Creado por Anisha Rai
hace alrededor de 8 años
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| Pregunta | Respuesta |
| What happens when elements react? | Their atoms join with other atoms to form compounds |
| What happens to electrons when elements react? | They are given, taken or shared to form ions or molecules to attain the electron arrangement of the nearest noble gas |
| What is the relative formula mass of a compound? | The sum of the relative atomic masses of the atoms in the numbers shown in the formula |
| What is a mole of a substance? | The relative formula mass of a substance, in grams |
| How can the percentage mass of an element be calculated? | From the relative atomic mass of the element in the formula and the relative formula mass of the compound |
| How can the empirical formula of a compound be calculated? | From the masses or percentages of the elements in a compound |
| How can chemical reacions be represented? | By word equations or by symbol equations |
| How can information about the states of reactants and products be included in chemical reactions? | (g) for gas (l) for liquid (s) for solid (aq) for aqueous solution |
| Are any atoms lost or made during chemical reactions? | No, so the mass of the products equals the mass of the reactants |
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